You can skip #2 if you already have an image that is the size of your screen on which you wish xplanet to
display the planet on

2) Kill all running modules, then run ksnapshot to capture full-screen the image generated onscreen by xplanet and save it out as ~/images/mybackground.png.
3) Modified my custom “look” file (~/.afterstep/looks/look.Mine) as follows: